The example I gave was well over a decade ago, was in a university environment (no children), no children were endangered, and my wife discarded the offending picture. I simply offered it as an example of the sort of pornography that people are willing to expose others to in a public environment. I think a lot of people imagine the airbrushed pin-ups of the 1950s when there is far harder and darker stuff available since the Clinton administration stopped prosecuting obscenity. You can find out details on how bad it gets in this Frontline episode (you can actually watch it online):
http://www.pbs.org/wgbh/pages/frontline/shows/porn/
Lots of information on the web site, too. Note that the program is very rough and not for children. It discusses, among other things, the Frontline crew attending a pornography filming so disturbing the the Frontline crew felt they had to leave.